关于精度,请高手进来解决一下.

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关于精度,请高手进来解决一下.
我进行零件装配,或进行模具装配,模具创建,有时信息栏提示,型腔组件和参照零件的精度不同.....等. 我做零件时从来没有设置过精度的,都是按默认模板做.怎么会出现这种现象?请问怎样解决?<img src="attachments/dvbbs/200310122052355248.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/200310122052355248.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />